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Haris Bogdanovich  
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 More options Sep 23 2011, 7:18 am
Newsgroups: comp.lang.prolog
From: "Haris Bogdanovich" <fbogdano...@xnet.hr>
Date: Fri, 23 Sep 2011 13:18:45 +0200
Local: Fri, Sep 23 2011 7:18 am
Subject: first steps
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Hi.

When I entuer in gnu prolog:
man (adam).
I get the following error:
uncaught exception: error(syntax_error('user_input:1 (char:5) . or operator
expected after expression'),read_term/3)
That would be  entering a fact.
What am I doing wrong ?

Thanks


 
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Andrew Davison  
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 More options Sep 23 2011, 8:44 am
Newsgroups: comp.lang.prolog
From: Andrew Davison <andrew.davi...@gmail.com>
Date: Fri, 23 Sep 2011 22:44:29 +1000
Local: Fri, Sep 23 2011 8:44 am
Subject: Re: first steps
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On 23/09/2011 9:18 PM, Haris Bogdanovich wrote:

> Hi.

> When I entuer in gnu prolog:
> man (adam).
> I get the following error:
> uncaught exception: error(syntax_error('user_input:1 (char:5) . or operator
> expected after expression'),read_term/3)
> That would be  entering a fact.
> What am I doing wrong ?

You are putting a space between 'man' and the '('.

 
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Haris Bogdanovich  
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 More options Sep 23 2011, 8:57 am
Newsgroups: comp.lang.prolog
From: "Haris Bogdanovich" <fbogdano...@xnet.hr>
Date: Fri, 23 Sep 2011 14:57:43 +0200
Local: Fri, Sep 23 2011 8:57 am
Subject: Re: first steps
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> You are putting a space between 'man' and the '('.
Now I wrote:

man(adam).
without a space and I got:
uncaught exception: error(existence_error(procedure,man/1),top_level/0)
What's wrong now ?

 
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Tomasz Budzeń  
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 More options Sep 23 2011, 9:38 am
Newsgroups: comp.lang.prolog
From: Tomasz Budzeń <tomasz.bud...@gmail.com>
Date: Fri, 23 Sep 2011 06:38:22 -0700 (PDT)
Local: Fri, Sep 23 2011 9:38 am
Subject: Re: first steps
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On 23 Wrz, 14:57, "Haris Bogdanovich" <fbogdano...@xnet.hr> wrote:

> > You are putting a space between 'man' and the '('.
> Now I wrote:

> man(adam).
> without a space and I got:
> uncaught exception: error(existence_error(procedure,man/1),top_level/0)
> What's wrong now ?

You try to query fact man/0, but you didn't have any facts in
database, so you get existence_error.
So you can either declare fact: ?- assertz(man(adam)).
or consult Prolog source file containing your facts, man(adam). or
man(X).

Regards,
Tomasz Budzeń


 
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Chip Eastham  
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 More options Sep 23 2011, 12:14 pm
Newsgroups: comp.lang.prolog
From: Chip Eastham <hardm...@gmail.com>
Date: Fri, 23 Sep 2011 09:14:09 -0700 (PDT)
Local: Fri, Sep 23 2011 12:14 pm
Subject: Re: first steps
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On Sep 23, 9:38 am, Tomasz Budzeń <tomasz.bud...@gmail.com> wrote:

This is something of a quirk/feature of gprolog.
Many implementations will return "no" or "false"
in such a case.

[GNU Prolog: Existence error]
http://www.gprolog.org/manual/gprolog.html#htoc40

Existence errors can be "caught" and handled by a
user supplied predicate.

This behavior can be changed by setting of a Prolog
flag called "unknown".  See here for the possible
values of that changeable flag:

http://www.gprolog.org/manual/gprolog.html#set-prolog-flag/2

regards, chip


 
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Chip Eastham  
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 More options Sep 26 2011, 11:34 am
Newsgroups: comp.lang.prolog
From: Chip Eastham <hardm...@gmail.com>
Date: Mon, 26 Sep 2011 08:34:01 -0700 (PDT)
Local: Mon, Sep 26 2011 11:34 am
Subject: Re: first steps
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On Sep 23, 8:57 am, "Haris Bogdanovich" <fbogdano...@xnet.hr> wrote:

> > You are putting a space between 'man' and the '('.
> Now I wrote:

> man(adam).
> without a space and I got:
> uncaught exception: error(existence_error(procedure,man/1),top_level/0)
> What's wrong now ?

It occurs to me perhaps you really mean to "assert" the fact
man(adam),
rather than to query to see if it is true.  To do this assertion:

:- assert(man(adam)).
yes

After that any queries for "man(adam)" will succeed.

regards, chip


 
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